feat(ingester): support metadata updates only #73
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Ingestion: Incremental Vector Store Updates (TypeScript)
updateDocumentsMetadata()to update metadata (andsourcecolumn) in-place byuniqueIdwithout re-embedding or replacing content.findChunksToUpdateAndRemove()now returns three buckets:contentChanged,metadataOnlyChanged, andchunksToRemove.updateVectorStore()now:addDocuments()(re-embeds as before).updateDocumentsMetadata()(no re-embed).ingesters/__tests__/vectorStoreUtils.test.tsto cover content-changed vs metadata-only cases; all tests pass.